mirror of
https://github.com/denoland/deno.git
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362 lines
11 KiB
TypeScript
362 lines
11 KiB
TypeScript
// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
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import { deepAssign } from "../_util/deep_assign.ts";
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interface BenchmarkClock {
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start: number;
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stop: number;
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for?: string;
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}
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/** Provides methods for starting and stopping a benchmark clock. */
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export interface BenchmarkTimer {
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start: () => void;
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stop: () => void;
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}
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/** Defines a benchmark through a named function. */
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export interface BenchmarkFunction {
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(b: BenchmarkTimer): void | Promise<void>;
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name: string;
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}
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/** Defines a benchmark definition with configurable runs. */
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export interface BenchmarkDefinition {
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func: BenchmarkFunction;
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name: string;
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/** Defines how many times the provided `func` should be benchmarked in succession */
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runs?: number;
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}
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/** Defines runBenchmark's run constraints by matching benchmark names. */
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export interface BenchmarkRunOptions {
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/** Only benchmarks which name match this regexp will be run*/
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only?: RegExp;
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/** Benchmarks which name match this regexp will be skipped */
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skip?: RegExp;
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/** Setting it to true prevents default benchmarking progress logs to the commandline*/
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silent?: boolean;
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}
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/** Defines clearBenchmark's constraints by matching benchmark names. */
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export interface BenchmarkClearOptions {
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/** Only benchmarks which name match this regexp will be removed */
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only?: RegExp;
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/** Benchmarks which name match this regexp will be kept */
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skip?: RegExp;
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}
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/** Defines the result of a single benchmark */
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export interface BenchmarkResult {
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/** The name of the benchmark */
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name: string;
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/** The total time it took to run a given bechmark */
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totalMs: number;
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/** Times the benchmark was run in succession. */
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runsCount: number;
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/** The average time of running the benchmark in milliseconds. */
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measuredRunsAvgMs: number;
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/** The individual measurements in milliseconds it took to run the benchmark.*/
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measuredRunsMs: number[];
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}
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/** Defines the result of a `runBenchmarks` call */
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export interface BenchmarkRunResult {
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/** How many benchmark were ignored by the provided `only` and `skip` */
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filtered: number;
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/** The individual results for each benchmark that was run */
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results: BenchmarkResult[];
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}
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/** Defines the current progress during the run of `runBenchmarks` */
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export interface BenchmarkRunProgress extends BenchmarkRunResult {
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/** List of the queued benchmarks to run with their name and their run count */
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queued: Array<{ name: string; runsCount: number }>;
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/** The currently running benchmark with its name, run count and the already finished measurements in milliseconds */
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running?: { name: string; runsCount: number; measuredRunsMs: number[] };
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/** Indicates in which state benchmarking currently is */
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state: ProgressState;
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}
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/** Defines the states `BenchmarkRunProgress` can be in */
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export enum ProgressState {
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BenchmarkingStart = "benchmarking_start",
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BenchStart = "bench_start",
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BenchPartialResult = "bench_partial_result",
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BenchResult = "bench_result",
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BenchmarkingEnd = "benchmarking_end",
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}
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export class BenchmarkRunError extends Error {
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benchmarkName?: string;
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constructor(msg: string, benchmarkName?: string) {
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super(msg);
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this.name = "BenchmarkRunError";
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this.benchmarkName = benchmarkName;
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}
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}
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function red(text: string): string {
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return Deno.noColor ? text : `\x1b[31m${text}\x1b[0m`;
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}
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function blue(text: string): string {
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return Deno.noColor ? text : `\x1b[34m${text}\x1b[0m`;
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}
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function verifyOr1Run(runs?: number): number {
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return runs && runs >= 1 && runs !== Infinity ? Math.floor(runs) : 1;
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}
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function assertTiming(clock: BenchmarkClock): void {
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// NaN indicates that a benchmark has not been timed properly
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if (!clock.stop) {
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throw new BenchmarkRunError(
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`Running benchmarks FAILED during benchmark named [${clock.for}]. The benchmark timer's stop method must be called`,
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clock.for
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);
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} else if (!clock.start) {
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throw new BenchmarkRunError(
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`Running benchmarks FAILED during benchmark named [${clock.for}]. The benchmark timer's start method must be called`,
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clock.for
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);
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} else if (clock.start > clock.stop) {
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throw new BenchmarkRunError(
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`Running benchmarks FAILED during benchmark named [${clock.for}]. The benchmark timer's start method must be called before its stop method`,
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clock.for
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);
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}
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}
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function createBenchmarkTimer(clock: BenchmarkClock): BenchmarkTimer {
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return {
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start(): void {
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clock.start = performance.now();
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},
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stop(): void {
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if (isNaN(clock.start)) {
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throw new BenchmarkRunError(
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`Running benchmarks FAILED during benchmark named [${clock.for}]. The benchmark timer's start method must be called before its stop method`,
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clock.for
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);
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}
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clock.stop = performance.now();
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},
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};
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}
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const candidates: BenchmarkDefinition[] = [];
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/** Registers a benchmark as a candidate for the runBenchmarks executor. */
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export function bench(
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benchmark: BenchmarkDefinition | BenchmarkFunction
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): void {
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if (!benchmark.name) {
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throw new Error("The benchmark function must not be anonymous");
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}
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if (typeof benchmark === "function") {
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candidates.push({ name: benchmark.name, runs: 1, func: benchmark });
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} else {
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candidates.push({
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name: benchmark.name,
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runs: verifyOr1Run(benchmark.runs),
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func: benchmark.func,
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});
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}
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}
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/** Clears benchmark candidates which name matches `only` and doesn't match `skip`.
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* Removes all candidates if options were not provided */
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export function clearBenchmarks({
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only = /[^\s]/,
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skip = /$^/,
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}: BenchmarkClearOptions = {}): void {
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const keep = candidates.filter(
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({ name }): boolean => !only.test(name) || skip.test(name)
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);
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candidates.splice(0, candidates.length);
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candidates.push(...keep);
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}
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/**
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* Runs all registered and non-skipped benchmarks serially.
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*
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* @param [progressCb] provides the possibility to get updates of the current progress during the run of the benchmarking
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* @returns results of the benchmarking
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*/
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export async function runBenchmarks(
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{ only = /[^\s]/, skip = /^\s*$/, silent }: BenchmarkRunOptions = {},
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progressCb?: (progress: BenchmarkRunProgress) => void | Promise<void>
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): Promise<BenchmarkRunResult> {
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// Filtering candidates by the "only" and "skip" constraint
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const benchmarks: BenchmarkDefinition[] = candidates.filter(
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({ name }): boolean => only.test(name) && !skip.test(name)
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);
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// Init main counters and error flag
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const filtered = candidates.length - benchmarks.length;
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let failError: Error | undefined = undefined;
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// Setting up a shared benchmark clock and timer
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const clock: BenchmarkClock = { start: NaN, stop: NaN };
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const b = createBenchmarkTimer(clock);
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// Init progress data
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const progress: BenchmarkRunProgress = {
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// bench.run is already ensured with verifyOr1Run on register
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queued: benchmarks.map((bench) => ({
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name: bench.name,
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runsCount: bench.runs!,
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})),
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results: [],
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filtered,
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state: ProgressState.BenchmarkingStart,
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};
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// Publish initial progress data
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await publishProgress(progress, ProgressState.BenchmarkingStart, progressCb);
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if (!silent) {
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console.log(
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"running",
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benchmarks.length,
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`benchmark${benchmarks.length === 1 ? " ..." : "s ..."}`
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);
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}
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// Iterating given benchmark definitions (await-in-loop)
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for (const { name, runs = 0, func } of benchmarks) {
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if (!silent) {
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// See https://github.com/denoland/deno/pull/1452 about groupCollapsed
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console.groupCollapsed(`benchmark ${name} ... `);
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}
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// Provide the benchmark name for clock assertions
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clock.for = name;
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// Remove benchmark from queued
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const queueIndex = progress.queued.findIndex(
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(queued) => queued.name === name && queued.runsCount === runs
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);
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if (queueIndex != -1) {
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progress.queued.splice(queueIndex, 1);
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}
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// Init the progress of the running benchmark
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progress.running = { name, runsCount: runs, measuredRunsMs: [] };
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// Publish starting of a benchmark
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await publishProgress(progress, ProgressState.BenchStart, progressCb);
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// Trying benchmark.func
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let result = "";
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try {
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// Averaging runs
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let pendingRuns = runs;
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let totalMs = 0;
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// Would be better 2 not run these serially
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while (true) {
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// b is a benchmark timer interfacing an unset (NaN) benchmark clock
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await func(b);
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// Making sure the benchmark was started/stopped properly
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assertTiming(clock);
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// Calculate length of run
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const measuredMs = clock.stop - clock.start;
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// Summing up
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totalMs += measuredMs;
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// Adding partial result
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progress.running.measuredRunsMs.push(measuredMs);
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// Publish partial benchmark results
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await publishProgress(
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progress,
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ProgressState.BenchPartialResult,
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progressCb
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);
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// Resetting the benchmark clock
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clock.start = clock.stop = NaN;
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// Once all ran
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if (!--pendingRuns) {
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result =
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runs == 1
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? `${totalMs}ms`
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: `${runs} runs avg: ${totalMs / runs}ms`;
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// Adding results
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progress.results.push({
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name,
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totalMs,
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runsCount: runs,
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measuredRunsAvgMs: totalMs / runs,
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measuredRunsMs: progress.running.measuredRunsMs,
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});
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// Clear currently running
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delete progress.running;
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// Publish results of the benchmark
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await publishProgress(
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progress,
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ProgressState.BenchResult,
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progressCb
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);
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break;
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}
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}
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} catch (err) {
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failError = err;
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if (!silent) {
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console.groupEnd();
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console.error(red(err.stack));
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}
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break;
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}
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if (!silent) {
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// Reporting
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console.log(blue(result));
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console.groupEnd();
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}
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// Resetting the benchmark clock
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clock.start = clock.stop = NaN;
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delete clock.for;
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}
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// Indicate finished running
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delete progress.queued;
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// Publish final result in Cb too
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await publishProgress(progress, ProgressState.BenchmarkingEnd, progressCb);
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if (!silent) {
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// Closing results
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console.log(
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`benchmark result: ${failError ? red("FAIL") : blue("DONE")}. ` +
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`${progress.results.length} measured; ${filtered} filtered`
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);
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}
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// Throw error if there was a failing benchmark
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if (failError) {
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throw failError;
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}
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const benchmarkRunResult = {
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filtered,
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results: progress.results,
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};
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return benchmarkRunResult;
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}
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async function publishProgress(
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progress: BenchmarkRunProgress,
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state: ProgressState,
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progressCb?: (progress: BenchmarkRunProgress) => void | Promise<void>
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): Promise<void> {
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progressCb && (await progressCb(cloneProgressWithState(progress, state)));
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}
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function cloneProgressWithState(
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progress: BenchmarkRunProgress,
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state: ProgressState
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): BenchmarkRunProgress {
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return deepAssign({}, progress, { state }) as BenchmarkRunProgress;
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}
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